Tungsten is a physically based renderer originally written for the yearly renderer competition at ETH. It simulates full light transport through arbitrary geometry based on unbiased integration of the rendering equation. To do this, Tungsten supports various light transport algorithms such as bidirectional path tracing, progressive photon mapping, primary sample space metropolis light transport and more. Tungsten is written in C++11 and makes use of Intel's high-performance geometry intersection library embree. Tungsten takes full advantage of multicore systems and tries to offer good performance through frequent benchmarking and optimization. At least SSE3 support is required to run the renderer.